According to the definition provided by the United States Department of Agriculture (USDA), sustainable agriculture refers to an agricultural production and distribution system that integrates natural biological cycles and controls, protects and renews soil fertility, optimizes the management of use of on-farm resources, reduces the use of non-renewable resources and purchased goods, provides an adequate and dependable farm income, promotes opportunity in family farming and farm communities, and minimizes adverse impacts to health, safety, wildlife, water quality and the environment.

Sustainable agriculture is simple, yet hard to define because it is constantly changing. How would you define sustainable agriculture?